Only display spacer row when necessary

If there are no existing branch mappings, the spacer row is useless

Fixes #244

Author: dregad

Source/pages/repo_manage_page.php

@@ -199,9 +199,9 @@ function convert_to_key_value( $p_array ) {
 		$t_disabled = 'disabled';
 		if( is_null( $t_mapping->branch ) ) {
 			$t_disabled = '';
-?>
-			<tr class="spacer"></tr><tr></tr>
-<?php
+			if( count( $t_mappings ) > 1 ) {
+				echo '<tr class="spacer"></tr>';
+			}
 		}
 ?>
 			<tr>